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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation
The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at March 31, 2016 and December 31, 2015 were as follows:
 
Amortized
cost
 
Gross
unrealized
holding
gains
 
Gross
unrealized
holding
losses
 
Estimated
fair value
March 31, 2016
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
$
19,422

 
$
136

 
$
(52
)
 
$
19,506

 
 
Municipal bonds
6,691

 
41

 
(1
)
 
6,731

 
Total available-for-sale securities
$
26,113

 
$
177

 
$
(53
)
 
$
26,237


 
Amortized
cost
 
Gross
unrealized
holding
gains
 
Gross
unrealized
holding
losses
 
Estimated
fair value
December 31, 2015
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
$
20,827

 
$
50

 
$
(133
)
 
$
20,744

 
 
Municipal bonds
5,608

 
18

 
(5
)
 
5,621

 
Total available-for-sale securities
$
26,435

 
$
68

 
$
(138
)
 
$
26,365



Maturities of marketable securities classified as available-for-sale securities were as follows at March 31, 2016:
 
Amortized
cost
 
Estimated
fair value
March 31, 2016
 
 
 
     Due within one year
$
5,881

 
$
5,890

 
     Due after one year through five years
19,247

 
19,365

 
     Due after five years through ten years
985

 
982

 
Total available-for-sale securities
$
26,113

 
$
26,237
Available-for-sale Securities
The available-for-sale marketable securities in a gross unrealized loss position as of March 31, 2016 are summarized as follows:
 
Less than 12 months
 
More than 12 months
 
Total
(In thousands)
Estimated
fair value
 
Gross
unrealized
holding
losses
 
Estimated
fair value
 
Gross
unrealized
holding
losses
 
Estimated
fair value
 
Gross
unrealized
holding
losses
As of March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
$
3,416

 
$
(38
)
 
$
1,644

 
$
(14
)
 
$
5,060

 
$
(52
)
Municipal bonds
—

 
—

 
200

 
(1
)
 
200

 
(1
)
 
 
 
 
 
 
 
 
 
 
 
 
 
$
3,416

 
$
(38
)
 
$
1,844

 
$
(15
)
 
$
5,260

 
$
(53
)